Side lobes are secondary and smaller acoustic beams falling outside at predictable angles located around the main lobe.

See also Grating-lobe Artifact, Amplitude Shading, and Apodization.

The range of diagnostics and imaging systems of Siemens Medical Systems covers ultrasound, nuclear medicine, angiography, magnetic resonance , computer tomography and patient monitoring.
In September 2000 Siemens Medical Engineering Group, bought Acuson Corporation (Mountain View, California) for approximately $700 million.

Ultrasound Systems:

Ultrasound Systems (older):

From Kontron Medical SAS;
'The Sigma 330 is a versatile, digital, mobile Ultrasound System, upgradeable from 2D to Doppler, Color Flow Mapping and 3D.
The Sigma 330 displays excellent image quality and superb Doppler and CFM sensitivity, employing ATEC™ (Advanced Tissue Echo Cancellation), a revolutionary technology developed by the Kontron Medical R&D Center, which removes tissue artifacts ('ghosting').'

Specifications for this system will be available soon.

Signal coupling in ultrasound is a term used to describe the state of sound propagation between the transducer and tissue. Signal coupling is degraded by air bubbles and materials that do not conduct sound.

(SNR) Signal to Noise Ratio is the ratio of the amplitude of a signal to undesired noise. The larger the signal noise ratio, the easier is the detection and measurement of a signal. The sensitivity of any device is limited by the SNR. The SNR for sound is often expressed in decibel.